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			<h1>Java实例之完善除法运算的错误信息</h1>
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			<div id="arc-body">本次实例的目的很简单，就是由用户输入两个数字，然后进行相除并输出结果。但是要求程序对除法运算过程中的各种异常进行捕捉并提示用户，例如除数是字符、被除数是零等。<br>
<br>
在这个实例中定义了一个数组来存放要执行运算的两个操作数，因此还需要对数组的索引越界异常进行处理，具体步骤如下。<br>
<br>
1）创建计算类 Compute，声明一个长度为 2 的 int 类型数组，接着编写 get() 和 set() 方法，代码如下：
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display: none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7076.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7076.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7076.html#">复制</a></pre></div><pre class="cpp sh_cpp snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">public</span> <span class="sh_keyword">class</span><span class="sh_normal"> </span><span class="sh_classname">Compute</span> <span class="sh_cbracket">{</span></li><li>    <span class="sh_keyword">private</span> <span class="sh_type">int</span><span class="sh_symbol">[]</span> num <span class="sh_symbol">=</span> <span class="sh_keyword">new</span> <span class="sh_type">int</span><span class="sh_symbol">[</span><span class="sh_number">2</span><span class="sh_symbol">];</span></li><li>    <span class="sh_keyword">public</span> <span class="sh_type">int</span><span class="sh_symbol">[]</span> <span class="sh_function">getNum</span><span class="sh_symbol">()</span> <span class="sh_cbracket">{</span></li><li>        <span class="sh_keyword">return</span> num<span class="sh_symbol">;</span></li><li>    <span class="sh_cbracket">}</span></li><li>    <span class="sh_keyword">public</span> <span class="sh_type">void</span> <span class="sh_function">setNum</span><span class="sh_symbol">(</span><span class="sh_type">int</span><span class="sh_symbol">[]</span> num<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>        <span class="sh_keyword">this</span><span class="sh_symbol">.</span>num <span class="sh_symbol">=</span> num<span class="sh_symbol">;</span></li><li>    <span class="sh_cbracket">}</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">public class Compute {
    private int[] num = new int[2];
    public int[] getNum() {
        return num;
    }
    public void setNum(int[] num) {
        this.num = num;
    }
}</pre></div></div>
<br>
2）在 Compute 类的 main() 方法中编写测试代码。定义一个 int 类型的变量 res 来接收计算的结果，将从控制台接收到的 int 类型的数据存储到数组中，如果输入 Y 表示将计算的结果存储到数组下标为 2 的位置，接着在控制台输出结果。代码如下：
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display:none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7076.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7076.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7076.html#">复制</a></pre></div><pre class="java sh_java snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">public</span> <span class="sh_keyword">class</span><span class="sh_normal"> </span><span class="sh_classname">Test04</span> <span class="sh_cbracket">{</span></li><li>    <span class="sh_keyword">public</span> <span class="sh_keyword">static</span> <span class="sh_type">void</span> <span class="sh_function">main</span><span class="sh_symbol">(</span>String<span class="sh_symbol">[]</span> args<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>        <span class="sh_usertype">Compute</span><span class="sh_normal"> </span>c <span class="sh_symbol">=</span> <span class="sh_keyword">new</span> <span class="sh_function">Compute</span><span class="sh_symbol">();</span></li><li>        <span class="sh_type">int</span> array<span class="sh_symbol">[]</span> <span class="sh_symbol">=</span> c<span class="sh_symbol">.</span><span class="sh_function">getNum</span><span class="sh_symbol">();</span></li><li>        <span class="sh_type">int</span> res <span class="sh_symbol">=</span> <span class="sh_number">0</span><span class="sh_symbol">;</span></li><li>        <span class="sh_usertype">String</span><span class="sh_normal"> </span>YorN <span class="sh_symbol">=</span> <span class="sh_keyword">null</span><span class="sh_symbol">;</span></li><li>        <span class="sh_usertype">Scanner</span><span class="sh_normal"> </span>in <span class="sh_symbol">=</span> <span class="sh_keyword">new</span> <span class="sh_function">Scanner</span><span class="sh_symbol">(</span>System<span class="sh_symbol">.</span>in<span class="sh_symbol">);</span></li><li>        <span class="sh_keyword">try</span> <span class="sh_cbracket">{</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"请输入第一个整数："</span><span class="sh_symbol">);</span></li><li>            array<span class="sh_symbol">[</span><span class="sh_number">0</span><span class="sh_symbol">]</span> <span class="sh_symbol">=</span> in<span class="sh_symbol">.</span><span class="sh_function">nextInt</span><span class="sh_symbol">();</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"请输入第二个整数："</span><span class="sh_symbol">);</span></li><li>            array<span class="sh_symbol">[</span><span class="sh_number">1</span><span class="sh_symbol">]</span> <span class="sh_symbol">=</span> in<span class="sh_symbol">.</span><span class="sh_function">nextInt</span><span class="sh_symbol">();</span></li><li>            res <span class="sh_symbol">=</span> array<span class="sh_symbol">[</span><span class="sh_number">0</span><span class="sh_symbol">]</span> <span class="sh_symbol">/</span> array<span class="sh_symbol">[</span><span class="sh_number">1</span><span class="sh_symbol">];</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"是否保存结果请输入Y或者N"</span><span class="sh_symbol">);</span></li><li>            YorN <span class="sh_symbol">=</span> in<span class="sh_symbol">.</span><span class="sh_function">next</span><span class="sh_symbol">();</span></li><li>            <span class="sh_keyword">if</span> <span class="sh_symbol">(</span>YorN<span class="sh_symbol">.</span><span class="sh_function">equals</span><span class="sh_symbol">(</span><span class="sh_string">"Y"</span><span class="sh_symbol">))</span> <span class="sh_cbracket">{</span></li><li>                array<span class="sh_symbol">[</span><span class="sh_number">2</span><span class="sh_symbol">]</span> <span class="sh_symbol">=</span> res<span class="sh_symbol">;</span></li><li>            <span class="sh_cbracket">}</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>array<span class="sh_symbol">[</span><span class="sh_number">0</span><span class="sh_symbol">]</span> <span class="sh_symbol">+</span> <span class="sh_string">"除以"</span> <span class="sh_symbol">+</span> array<span class="sh_symbol">[</span><span class="sh_number">1</span><span class="sh_symbol">]</span> <span class="sh_symbol">+</span> <span class="sh_string">"的结果是："</span> <span class="sh_symbol">+</span> res<span class="sh_symbol">);</span></li><li>        <span class="sh_cbracket">}</span></li><li>    <span class="sh_cbracket">}</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">public class Test04 {
    public static void main(String[] args) {
        Compute c = new Compute();
        int array[] = c.getNum();
        int res = 0;
        String YorN = null;
        Scanner in = new Scanner(System.in);
        try {
            System.out.println("请输入第一个整数：");
            array[0] = in.nextInt();
            System.out.println("请输入第二个整数：");
            array[1] = in.nextInt();
            res = array[0] / array[1];
            System.out.println("是否保存结果请输入Y或者N");
            YorN = in.next();
            if (YorN.equals("Y")) {
                array[2] = res;
            }
            System.out.println(array[0] + "除以" + array[1] + "的结果是：" + res);
        }
    }
}</pre></div></div>
3）使用 catch 分别捕获可能出现的异常，代码如下。
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display:none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7076.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7076.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7076.html#">复制</a></pre></div><pre class="cpp sh_cpp snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">catch</span> <span class="sh_symbol">(</span><span class="sh_usertype">ArrayIndexOutOfBoundsException</span><span class="sh_normal"> </span>e<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"出现数组越界错误，下标过大或者过小。"</span><span class="sh_symbol">);</span></li><li><span class="sh_cbracket">}</span> <span class="sh_keyword">catch</span><span class="sh_symbol">(</span><span class="sh_usertype">ArithmeticException</span><span class="sh_normal"> </span>e<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"出现算术运算错误，被除数不能为0。"</span><span class="sh_symbol">);</span></li><li><span style="display:none;">&nbsp;</span></li><li><span class="sh_cbracket">}</span> <span class="sh_keyword">catch</span><span class="sh_symbol">(</span><span class="sh_usertype">InputMismatchException</span><span class="sh_normal"> </span>e<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"输入的数据类型不匹配，只能输入数字。"</span><span class="sh_symbol">);</span></li><li><span class="sh_cbracket">}</span> <span class="sh_keyword">catch</span><span class="sh_symbol">(</span><span class="sh_usertype">Exception</span><span class="sh_normal"> </span>e<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>    System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span><span class="sh_string">"发生未知错误。"</span><span class="sh_symbol">);</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">catch (ArrayIndexOutOfBoundsException e) {
    System.out.println("出现数组越界错误，下标过大或者过小。");
} catch(ArithmeticException e) {
    System.out.println("出现算术运算错误，被除数不能为0。");

} catch(InputMismatchException e) {
    System.out.println("输入的数据类型不匹配，只能输入数字。");
} catch(Exception e) {
    System.out.println("发生未知错误。");
}</pre></div></div>
4）运行程序，先输入一个整数，接着第二个数输入 0，此时程序发生算术运算异常，异常被异常类型为 ArithmeticException 的 catch 语句块捕获，控制台会输出“出现算术运算错误，被除数不能为0。”，执行效果如下所示。
<pre class="info-box">请输入第一个整数：
100
请输入第二个整数：
0
出现算术运算错误，被除数不能为0。</pre>
<br>
5）重新运行程序，先输入一个整数，接着第二个数中输入一个字符，此时程序发生类型不匹配异常，异常被异常类型为 InputMismatchException 的 catch 语句块捕获，控制台会输出“输入的数据类型不匹配，只能输入数字。”，执行效果如下所示。
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display:none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7076.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7076.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7076.html#">复制</a></pre></div><pre class="info=box sh_info=box snippet-formatted"><ol class="snippet-num"><li>请输入第一个整数：</li><li>100</li><li>请输入第二个整数：</li><li>9t</li><li>输入的数据类型不匹配，只能输入数字。</li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">请输入第一个整数：
100
请输入第二个整数：
9t
输入的数据类型不匹配，只能输入数字。</pre></div></div>
<br>
6）继续运行程序，输入两个整数，然后控制台输出“是否保存结果请输入Y 或者 N”。此时输入“Y”，程序发生数组越界异常，因为长度为 2 的数组，其下标最大为 1。将结果保存在 array[2] 时出现数组越界错误，控制台输出“出现数组越界错误，下标过大或者过小”。执行效果如下所示。
<pre class="info-box">请输入第一个整数：
100
请输入第二个整数：
10
是否保存结果请输入Y或者N
Y
出现数组越界错误，下标过大或者过小。</pre>
<br>
7）再次运行程序，输入两个整数。当控制台输出“是否保存结果请输入Y或者N”时，输入“N”，表示不保存运行结果，也就不需要对下标为 2 的地址空间的访问，那么不会发生数组越界异常，程序可以顺序执行到 try 语句块中的最后一个输出语句。执行效果如下所示。
<pre class="info-box">请输入第一个整数：
100
请输入第二个整数：
20
是否保存结果请输入Y或者N
N
100除以20的结果是：5</pre>
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